ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning electrochemical microscopy. 19. Ion-selective potentiometric microscopyBenjamin R. Horrocks, Michael V. Mirkin, David T. Pierce, Allen J. Bard, Geza. Nagy, and Klara. TothCite this: Anal. Chem. 1993, 65, 9, 1213–1224Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 1993https://pubs.acs.org/doi/10.1021/ac00057a019https://doi.org/10.1021/ac00057a019research-articleACS PublicationsRequest...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning electrochemical microscopy. 24. Enzyme ultramicroelectrodes for the measurement of hydrogen peroxide at surfacesBenjamin R. Horrocks, David. Schmidtke, Adam. Heller, and Allen J. BardCite this: Anal. Chem. 1993, 65, 24, 3605–3614Publication Date (Print):December 15, 1993Publication History Published online1 May 2002Published inissue 15 December...

The isolation of 2D-materials is already a success for graphene, graphene oxide, boron nitride and few clays or metal chalcogenides, however despite the fact that some them show very interesting physical properties, they lack useful functionalities. Metal-Organic Frameworks (MOFs) are multifunctional materials showing wide range chemical properties can be structurally designed by suitable selection their building-blocks. This strategy may allow production layers with variety electronic...

Amphotericin B (AMB) is used most commonly in severe systemic life-threatening fungal infections. There currently an unmet need for efficacious formulation amenable to oral administration with better bioavailability and lower nephrotoxicity. Novel PEGylated polylactic-polyglycolic acid copolymer (PLGA-PEG) nanoparticles (NPs) formulations of AMB were therefore studied their ability kill Candida albicans (C. albicans). The antifungal activity was assessed C. albicans. Its bioavalability...

The hydrogen-terminated surface of porous silicon (PS) is sufficiently reactive for the uncatalyzed hydrosilation alkenes and alkynes. These modifications produce dramatic changes to both physical chemical properties PS.

Experimental results from electrochemical e.s.r. on electrodes modified with conducting polymers such as polyaniline, polypyrrole and polythiophene are presented. The show that the polymer exists in two forms, one stable when it is insulating (α) other (β) conducting. In region kinetics of transformation metastable α form into β can be followed by It further shown lightly oxidised films there a one-to-one correlation between charge injected spins. These explained chemical redox model opposed...

Nanocrystals of various inorganic materials are being considered for application in the life sciences as fluorescent labels and such therapeutic applications drug delivery or targeted cell destruction. The potential nanoparticles critically compromised due to well-documented toxicity lack understanding about mechanisms involved intracellular internalization. Here internalization alkyl-capped silicon nanocrystals human neoplastic normal primary cells is reported. capped cytotoxicity, there a...

Amphotericin B (AmB) is an effective anti-fungal and anti-leishmanial agent. However, AmB has low oral bioavailability (0.3%) adverse effects (e.g., nephrotoxicity). The objectives of this study were to improve the by entrapping in pegylated (PEG) poly lactide co glycolide copolymer (PLGA-PEG) nanoparticles (NPs). feasibility different surfactants stabilizers on mean particle size (MPS) entrapment efficiency also investigated.NPs prepared a modified emulsification diffusion method employing...

DNA-templating has been used to create nanowires from metals, compound semiconductors and conductive polymers. The mechanism of growth involves nucleation at binding sites on the DNA followed by spherical particles then, under favourable conditions, a slow transformation smooth nanowire. final is favoured restricting amount templated material per unit length template occurs most readily for materials low surface tension. Electrical measurements DNA-templated can be facilitated using three...

The reaction of fluoride-etched silicon surfaces with a range alcohols yields self-assembled films which involve direct bonding to in contrast the usual oxide-based methods. Contact-angle measurements and electrochemistry have been used confirm adsorption on (111) wafers. This method provides convenient route design molecular-based structures silicon.

Covalent ties: The polyoxometalate (nBu4N)3[(MeO)TiW5O18] is easily anchored to alkanol-functionalized surfaces of porous and single-crystal silicon (see picture, polyhedra: polyoxometalate, dark blue: Si surface). Scanning tunneling microscopy reveals the growth 35–50 nm diameter islands on functionalized Si(111), which suggests that immobilized polyoxometalates act as nucleation sites for electrostatic aggregation.

The synthesis of supramolecular conducting nanowires can be achieved by using DNA and pyrrole. Oxidation pyrrole in DNA-containing solutions yields a material that contains both the cationic polypyrrole (PPy) anionic polymers. Intimate interaction two polymer chains self-assembled is indicated FTIR spectroscopy. AFM imaging shows individual to continuous, approximately 5 nm high conformationally flexible. This feature allows them aligned molecular combing similar manner bare provides...

Polyindole (PIn) nanowires were formed on a lambda-DNA template by chemical oxidation of indole using aqueous FeCl3. The resulting are smooth, regular, conductive and had diameters in the range 5-30 nm. These features allow them to be aligned molecular combing studied scanned conductance microscopy, AFM, two-terminal I-V measurements. Using this combination measurements, we find that conductivity PIn/DNA is between 2.5 40 S cm(-1) at room temperature, which substantially greater than...

Abstract Polypyrrole nanowires formed by polymerization of pyrrole on a DNA template self‐assemble into rope‐like structures. These ‘nanoropes’ may be quite smooth (diameters 5–30 nm) or show frayed ends where individual strands are visible. A combination electric force microscopy, conductive atomic microscopy and two‐terminal current–voltage measurements that they conductive. Nanoropes adhere more weakly to hydrophobic surfaces prepared silanization SiO 2 than the clean oxide; this effect...

Zwitterionic materials display antifouling promise, but their potential in marine anti-biofouling is still largely unexplored. This study evaluates the effectiveness of incorporating small quantities (0–20% on a molar basis) zwitterions as sulfobetaine methacrylate (SBMA) or carboxybetaine (CBMA) into lauryl methacrylate-based coatings whose relatively hydrophobic nature encourages adhesion diatom Navicula incerta, common microfouling organism responsible for formation 'slime'. approach...

Complementary strands and redox intercalators can be self-assembled into nanoscale structures capable of charge transfer at the electrode surface from DNA oligomers synthesized directly covalently modified semiconductor silicon surfaces (see schematic representation).

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScanning Electrochemical Microscopy. 25. Application to Investigation of the Kinetics Heterogeneous Electron Transfer at Semiconductor (WSe2 and Si) ElectrodesBenjamin R. Horrocks, Michael V. Mirkin, Allen J. BardCite this: Phys. Chem. 1994, 98, 37, 9106–9114Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Published inissue 1 September...

The preparation of two-component polymer composite nanoparticles encapsulating both Si quantum dots (SiQDs) and Au (AuNPs) by a single step miniemulsion polymerization divinylbenzene is described. This simple robust method affords well-defined with mean diameters in range 100–200 nm narrow polydispersity indices as determined dynamic light scattering transmission electron microscopy. successful encapsulation AuNPs within poly(divinylbenzene) was confirmed UV-visible spectroscopy from TEM...

The silver-nucleoside complex [Ag(<sc>i</sc>)-(<italic>N</italic>3-cytidine)₂]⁺, <bold>1</bold>, self-assembles to form a supramolecular metal-mediated base-pair array highly analogous those seen in metallo-DNA.

An understanding of proton transfer and migration at the surfaces solid metal oxides related molecular polyoxometalates (POMs) alkoxides is crucial for development reactivity involving protonation or absorption/binding water. In this work, hydrolysis alkoxido Ti- Sn-substituted Lindqvist [(MeO)MW5O18]3– (M = Ti, 1; M Sn, 2) Keggin [(MeO)MPW11O39]4– 3; 4) type to hydroxido derivatives subsequent condensation μ-oxido species has been investigated in detail provide insight into reactions these...